If you're thinking of a video game, I have almost no expertise on the subject. I know absolutely nothing about designing video games.
But I do know something about stories.
If you just need help coming up with a cool concept, then I might be able to help you. I once heard somewhere that all stories are remixes. Everything has already been done. Or, in the words of Ecclesiastes, "There is nothing new under the sun." The solution? Follow this formula: copy, combine, transform. Copy something else, combine it with yet another thing, and then transform it all into still another thing.
Now, it should be noted that the key to this tactic is that you have to draw upon story material which isn't particularly well known. As an old creative writing teacher of mine once said, "True originality is obscurity of source." The more obscure the stuff you copy, combine, and transform, the better.
Now, let's see here. You want to make a cyberpunk video game? Hm. That fact that you're making a video game puts some limits on your scope already. I do know, thanks to the folks at the YouTube channel Extra Credits, that video games can be expensive and time consuming to create, especially the big, epic smash-em-ups like
Halo[ and
Final Fantasy. I don't know anything about the amount of resources at your disposal, but I'd advise starting small if you don't have much to operate on. Just something to keep in mind.
I don't think it would be very productive to give you any ideas out of whole cloth, but I will commend this lesson to you: Draw on obscure sources and draw on a lot of them.
Now, go conquer the world!